Antioffset mechanism for printing presses



Aug. 9, 1927.` 1,638,576

R. J. GREENWAY ANTI-OFFSET MECHANISM FOR PRINTING PRESSES Filed March 5,1925 INVENToR ATTORNEYS Patented Aug. 9, 1927.

RICHARD J. GREENWAXOF wnsTnnLY, RHODE ISLAND, AssIGNoR r.ro C. B,COTTRELI. a soNs COMPANY, or sroNINGrON, CONNECTICUT, .A CORPORATION orDELA WARE.

Application `filed March 3, 1925. Serial No..12,847. i

The object of my invention is to provide Certain improvements in theconstruction, form and'arrangement of the several parts of the offsetmechanism whereby antioffset powder is applied to the surface of amovable offset element, such as the offset cylinder which Comes inContact with a freshly printed side of a traveling web, so as to notonly prevent smutting or sticking of the sheets in the delivery pile butalso to prevent offsetting onto the packing of the offset cylinder,thereby materially prolonging the effective life of the said packing.

A practical embodiment of my invention The web 1 4which has justibcenprintedV upon one side by the first printing unit (not shown herein) isrepresented as passing around the Offset Cylinder 2 Vof thesecondprinting yunit to be printed on its opposite..

side, This offset Cylinder 2 has its shaft 3 suitably mounted inthe'frame 4.

The vOffset cylinder 2 maybe provided The endless belt with the usualpacking 5. 6 passes aroundthe drive roll 7, the idler rollsl 8, -9 andthe belt tightenerl roll 10.l

These rolls are all suitably mounted in the frame 4 and the rolls 8 and9 Vare so arranged as to cause the endless belt 6 to'have an extendedContact with thev packing 5 on the offset cylinder 2. i.

y The. anti-offset powder supply fountain is denoted by 11and itsfountain roll 12 is arranged in position to supply the anti-offsetpowder directly to the endless lbelt 6 for transfer' thereby Onto thepacking 5 ofthe Offset Cylinder 2. Y

An adjustable doctor knife 13 is mounted in the fountain 11 in positionto regulate the amount of anti-offset powder supplied by the fountainroll 12 to the endless belt 6.

`The offset cylinder, theendless belt and the fountain roll are drivenat the same surface speed through .the gears 14, 15, shaft FF-Ieclf 16,bevel `gears 17, 18, .shaft 19, bevelgears 20,721, shaft 22 and gears23, 24. f

`It will be seen that bythis arrangement I am enabled to apply theanti-offset powder to the surface of the oifsetcylinder 2, which side ofthe traveling web 1, the supply being regulated by the doctor knifev 13,so that all waste of the powder may be eliminated and also so that toomuchpowder need not be applied to the freshly printed side ofthe VThisarrangement not only increases` web. theeffective life of the packing onthe or'set cylinder by preventing offset thereon, but

also prevents the smutting and `sticking of the sheets cut from the webwhen delivered into the pile. f It is ,evident that various changes maybe resorted to in the Construction, form and arrangement of theseveralparts without departing from the spirit and scope fof myl invention;Ahence, I do not intendV to limit myself to the particular embodimentherein shown anddescribed, butv What Iclaim is:-l 1. A rotary offsetcylinder around which a traveling lweb is passed with af freshly insaigd cylinder, an anti-offset-powder supply fountain, and a fountainrollfor ,supplyingl anti-offset powder to the saidbelt forappli-f cationthereby to the web contacting surface ofthe oifsetcylinder. .Y

Y 2.. A rotary odset-cylinder around which Vprinted side in Contacttherewith, `a travel- .i

endless belt arranged for contact'with'.

a traveling web is passedl with a freshly,v

' printed side in vContact therewith, a traveling endless belt arrangedfor.' Contact withl said cylinder, an'anti-oft'set powder supplyfountain, a fountain roll for supplying anti-k Oifset'powder to the saidbelt for application thereby to the web contacting surface of the offsetCylinder, and means for driving the cylinder, belt and fountain roll `atthe same surface speed.'

In testimony, that Il claim the foregoing as my invention, I havesignedmy name this- 27th day of February, A; D, 1925.

